This is a disk image of Debian (ports) Sid for Wii U (PowerPC 32bit BE) I did.
It has ssh, btop, hwinfo, neofetch, apache2, php8.2, up and running on the system.
Its based from the unofficial ports mirror. Since big endian power pc has been unsupported for a few years ago. It uses the same Wii U 4.19.x kernel as the Wii U Gentoo. the latest kernel the module/driver for the Wii LAN adaptor (asix.ko) is not well built for the 4.19.287 (mid-2023) kernel.
You will need a Wii U with custom firmware, like Tiramisu. As well have the fw.img file on the root of your SD card:
It is compressed as a img.xz file. You can use Gnome disk utility on Ubuntu to decompress and write to a USB storage device at the same time. The OS runs of of the USB drive (its not installed to internal storage or SDHC slot). If you have Tiramisu CFW, You can boot straight into Linux by holding down the B button on the Wii U Gamepad and selecting the fw.img payload. If you use Haxchi, you have to go to the homebrew launcher to boot the fw.img.
Update (October 29th 2023): I created a new image with a fixed .bashrc file for the wiiu user where some paths where not set. I also updated the packages while I was at it.
Update (January 29th 2024): I updated the packages further and also added the program Aptitude.